No gasket needed? Cylinder head leaking

cjxs

XS400 Enthusiast
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I've noticed that I have a leak from the right side of the engine. Right side is also running very lean, the spark plug is almost white while the left side has a a thick black coat.

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I'm quite far away from the bike now and that is not the picture of my engine but I marked the leak area with red. I thought it could be a bad gasket but it seems there should be no gasket at all there.

I want to order the parts needed for fixing it beforehand, so when I come back I already have them and can start working on the bike.

Any ideas what could cause that and what should I be looking at buying?
 
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